fe82637069
Similar to Apple, use the native physical core count sysctl, when available. This is a little repetitive (it's basically the __APPLE__ method plus the otherBSD method concatenated together) but seemed clearer than any way that would totally eliminate repetition. The __FreeBSD_version check only tests the version of the FreeBSD kernel that zstd is compiled on; importantly, it may be run on a different version. So the compile-time check is a little naive and needs to be able to fallback to work on older versions of FreeBSD. For a similar reason, it may make sense to simply eliminate the __FreeBSD_version check entirely. The tradeoff is that a spurious sysctlbyname would be issued when -T0 is used on older kernels.
706 lines
22 KiB
C
706 lines
22 KiB
C
/*
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* Copyright (c) 2016-present, Przemyslaw Skibinski, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#if defined (__cplusplus)
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extern "C" {
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#endif
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/*-****************************************
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* Dependencies
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******************************************/
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#include "util.h" /* note : ensure that platform.h is included first ! */
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#include <errno.h>
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#include <assert.h>
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int UTIL_fileExist(const char* filename)
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{
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stat_t statbuf;
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#if defined(_MSC_VER)
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int const stat_error = _stat64(filename, &statbuf);
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#else
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int const stat_error = stat(filename, &statbuf);
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#endif
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return !stat_error;
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}
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int UTIL_isRegularFile(const char* infilename)
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{
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stat_t statbuf;
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return UTIL_getFileStat(infilename, &statbuf); /* Only need to know whether it is a regular file */
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}
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int UTIL_getFileStat(const char* infilename, stat_t *statbuf)
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{
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int r;
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#if defined(_MSC_VER)
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r = _stat64(infilename, statbuf);
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if (r || !(statbuf->st_mode & S_IFREG)) return 0; /* No good... */
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#else
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r = stat(infilename, statbuf);
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if (r || !S_ISREG(statbuf->st_mode)) return 0; /* No good... */
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#endif
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return 1;
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}
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int UTIL_setFileStat(const char *filename, stat_t *statbuf)
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{
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int res = 0;
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struct utimbuf timebuf;
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if (!UTIL_isRegularFile(filename))
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return -1;
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timebuf.actime = time(NULL);
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timebuf.modtime = statbuf->st_mtime;
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res += utime(filename, &timebuf); /* set access and modification times */
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#if !defined(_WIN32)
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res += chown(filename, statbuf->st_uid, statbuf->st_gid); /* Copy ownership */
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#endif
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res += chmod(filename, statbuf->st_mode & 07777); /* Copy file permissions */
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errno = 0;
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return -res; /* number of errors is returned */
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}
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U32 UTIL_isDirectory(const char* infilename)
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{
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int r;
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stat_t statbuf;
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#if defined(_MSC_VER)
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r = _stat64(infilename, &statbuf);
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if (!r && (statbuf.st_mode & _S_IFDIR)) return 1;
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#else
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r = stat(infilename, &statbuf);
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if (!r && S_ISDIR(statbuf.st_mode)) return 1;
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#endif
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return 0;
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}
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U32 UTIL_isLink(const char* infilename)
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{
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/* macro guards, as defined in : https://linux.die.net/man/2/lstat */
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#ifndef __STRICT_ANSI__
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#if defined(_BSD_SOURCE) \
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|| (defined(_XOPEN_SOURCE) && (_XOPEN_SOURCE >= 500)) \
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|| (defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED)) \
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|| (defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200112L)) \
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|| (defined(__APPLE__) && defined(__MACH__))
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int r;
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stat_t statbuf;
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r = lstat(infilename, &statbuf);
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if (!r && S_ISLNK(statbuf.st_mode)) return 1;
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#endif
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#endif
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(void)infilename;
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return 0;
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}
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U64 UTIL_getFileSize(const char* infilename)
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{
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if (!UTIL_isRegularFile(infilename)) return UTIL_FILESIZE_UNKNOWN;
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{ int r;
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#if defined(_MSC_VER)
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struct __stat64 statbuf;
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r = _stat64(infilename, &statbuf);
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if (r || !(statbuf.st_mode & S_IFREG)) return UTIL_FILESIZE_UNKNOWN;
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#elif defined(__MINGW32__) && defined (__MSVCRT__)
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struct _stati64 statbuf;
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r = _stati64(infilename, &statbuf);
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if (r || !(statbuf.st_mode & S_IFREG)) return UTIL_FILESIZE_UNKNOWN;
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#else
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struct stat statbuf;
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r = stat(infilename, &statbuf);
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if (r || !S_ISREG(statbuf.st_mode)) return UTIL_FILESIZE_UNKNOWN;
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#endif
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return (U64)statbuf.st_size;
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}
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}
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U64 UTIL_getTotalFileSize(const char* const * const fileNamesTable, unsigned nbFiles)
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{
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U64 total = 0;
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int error = 0;
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unsigned n;
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for (n=0; n<nbFiles; n++) {
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U64 const size = UTIL_getFileSize(fileNamesTable[n]);
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error |= (size == UTIL_FILESIZE_UNKNOWN);
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total += size;
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}
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return error ? UTIL_FILESIZE_UNKNOWN : total;
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}
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#ifdef _WIN32
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int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks)
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{
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char* path;
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int dirLength, fnameLength, pathLength, nbFiles = 0;
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WIN32_FIND_DATAA cFile;
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HANDLE hFile;
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dirLength = (int)strlen(dirName);
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path = (char*) malloc(dirLength + 3);
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if (!path) return 0;
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memcpy(path, dirName, dirLength);
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path[dirLength] = '\\';
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path[dirLength+1] = '*';
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path[dirLength+2] = 0;
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hFile=FindFirstFileA(path, &cFile);
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if (hFile == INVALID_HANDLE_VALUE) {
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UTIL_DISPLAYLEVEL(1, "Cannot open directory '%s'\n", dirName);
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return 0;
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}
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free(path);
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do {
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fnameLength = (int)strlen(cFile.cFileName);
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path = (char*) malloc(dirLength + fnameLength + 2);
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if (!path) { FindClose(hFile); return 0; }
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memcpy(path, dirName, dirLength);
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path[dirLength] = '\\';
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memcpy(path+dirLength+1, cFile.cFileName, fnameLength);
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pathLength = dirLength+1+fnameLength;
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path[pathLength] = 0;
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if (cFile.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
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if ( strcmp (cFile.cFileName, "..") == 0
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|| strcmp (cFile.cFileName, ".") == 0 )
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continue;
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/* Recursively call "UTIL_prepareFileList" with the new path. */
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nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd, followLinks);
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if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
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} else if ( (cFile.dwFileAttributes & FILE_ATTRIBUTE_NORMAL)
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|| (cFile.dwFileAttributes & FILE_ATTRIBUTE_ARCHIVE)
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|| (cFile.dwFileAttributes & FILE_ATTRIBUTE_COMPRESSED) ) {
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if (*bufStart + *pos + pathLength >= *bufEnd) {
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ptrdiff_t const newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
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*bufStart = (char*)UTIL_realloc(*bufStart, newListSize);
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if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
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*bufEnd = *bufStart + newListSize;
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}
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if (*bufStart + *pos + pathLength < *bufEnd) {
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memcpy(*bufStart + *pos, path, pathLength+1 /* include final \0 */);
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*pos += pathLength + 1;
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nbFiles++;
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}
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}
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free(path);
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} while (FindNextFileA(hFile, &cFile));
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FindClose(hFile);
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return nbFiles;
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}
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#elif defined(__linux__) || (PLATFORM_POSIX_VERSION >= 200112L) /* opendir, readdir require POSIX.1-2001 */
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int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks)
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{
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DIR *dir;
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struct dirent *entry;
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char* path;
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int dirLength, fnameLength, pathLength, nbFiles = 0;
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if (!(dir = opendir(dirName))) {
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UTIL_DISPLAYLEVEL(1, "Cannot open directory '%s': %s\n", dirName, strerror(errno));
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return 0;
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}
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dirLength = (int)strlen(dirName);
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errno = 0;
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while ((entry = readdir(dir)) != NULL) {
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if (strcmp (entry->d_name, "..") == 0 ||
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strcmp (entry->d_name, ".") == 0) continue;
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fnameLength = (int)strlen(entry->d_name);
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path = (char*) malloc(dirLength + fnameLength + 2);
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if (!path) { closedir(dir); return 0; }
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memcpy(path, dirName, dirLength);
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path[dirLength] = '/';
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memcpy(path+dirLength+1, entry->d_name, fnameLength);
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pathLength = dirLength+1+fnameLength;
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path[pathLength] = 0;
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if (!followLinks && UTIL_isLink(path)) {
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UTIL_DISPLAYLEVEL(2, "Warning : %s is a symbolic link, ignoring\n", path);
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continue;
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}
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if (UTIL_isDirectory(path)) {
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nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd, followLinks); /* Recursively call "UTIL_prepareFileList" with the new path. */
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if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
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} else {
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if (*bufStart + *pos + pathLength >= *bufEnd) {
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ptrdiff_t newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
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*bufStart = (char*)UTIL_realloc(*bufStart, newListSize);
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*bufEnd = *bufStart + newListSize;
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if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
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}
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if (*bufStart + *pos + pathLength < *bufEnd) {
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memcpy(*bufStart + *pos, path, pathLength + 1); /* with final \0 */
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*pos += pathLength + 1;
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nbFiles++;
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}
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}
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free(path);
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errno = 0; /* clear errno after UTIL_isDirectory, UTIL_prepareFileList */
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}
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if (errno != 0) {
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UTIL_DISPLAYLEVEL(1, "readdir(%s) error: %s\n", dirName, strerror(errno));
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free(*bufStart);
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*bufStart = NULL;
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}
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closedir(dir);
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return nbFiles;
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}
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#else
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int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd, int followLinks)
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{
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(void)bufStart; (void)bufEnd; (void)pos; (void)followLinks;
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UTIL_DISPLAYLEVEL(1, "Directory %s ignored (compiled without _WIN32 or _POSIX_C_SOURCE)\n", dirName);
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return 0;
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}
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#endif /* #ifdef _WIN32 */
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/*
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* UTIL_createFileList - takes a list of files and directories (params: inputNames, inputNamesNb), scans directories,
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* and returns a new list of files (params: return value, allocatedBuffer, allocatedNamesNb).
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* After finishing usage of the list the structures should be freed with UTIL_freeFileList(params: return value, allocatedBuffer)
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* In case of error UTIL_createFileList returns NULL and UTIL_freeFileList should not be called.
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*/
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const char**
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UTIL_createFileList(const char **inputNames, unsigned inputNamesNb,
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char** allocatedBuffer, unsigned* allocatedNamesNb,
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int followLinks)
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{
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size_t pos;
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unsigned i, nbFiles;
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char* buf = (char*)malloc(LIST_SIZE_INCREASE);
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char* bufend = buf + LIST_SIZE_INCREASE;
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const char** fileTable;
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if (!buf) return NULL;
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for (i=0, pos=0, nbFiles=0; i<inputNamesNb; i++) {
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if (!UTIL_isDirectory(inputNames[i])) {
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size_t const len = strlen(inputNames[i]);
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if (buf + pos + len >= bufend) {
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ptrdiff_t newListSize = (bufend - buf) + LIST_SIZE_INCREASE;
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buf = (char*)UTIL_realloc(buf, newListSize);
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bufend = buf + newListSize;
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if (!buf) return NULL;
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}
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if (buf + pos + len < bufend) {
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memcpy(buf+pos, inputNames[i], len+1); /* with final \0 */
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pos += len + 1;
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nbFiles++;
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}
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} else {
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nbFiles += UTIL_prepareFileList(inputNames[i], &buf, &pos, &bufend, followLinks);
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if (buf == NULL) return NULL;
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} }
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if (nbFiles == 0) { free(buf); return NULL; }
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fileTable = (const char**)malloc((nbFiles+1) * sizeof(const char*));
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if (!fileTable) { free(buf); return NULL; }
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for (i=0, pos=0; i<nbFiles; i++) {
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fileTable[i] = buf + pos;
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pos += strlen(fileTable[i]) + 1;
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}
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if (buf + pos > bufend) { free(buf); free((void*)fileTable); return NULL; }
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*allocatedBuffer = buf;
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*allocatedNamesNb = nbFiles;
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return fileTable;
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}
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/*-****************************************
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* Console log
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******************************************/
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int g_utilDisplayLevel;
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/*-****************************************
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* Time functions
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******************************************/
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#if defined(_WIN32) /* Windows */
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UTIL_time_t UTIL_getTime(void) { UTIL_time_t x; QueryPerformanceCounter(&x); return x; }
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U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd)
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{
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static LARGE_INTEGER ticksPerSecond;
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static int init = 0;
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if (!init) {
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if (!QueryPerformanceFrequency(&ticksPerSecond))
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UTIL_DISPLAYLEVEL(1, "ERROR: QueryPerformanceFrequency() failure\n");
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init = 1;
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}
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return 1000000ULL*(clockEnd.QuadPart - clockStart.QuadPart)/ticksPerSecond.QuadPart;
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}
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U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd)
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{
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static LARGE_INTEGER ticksPerSecond;
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static int init = 0;
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if (!init) {
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if (!QueryPerformanceFrequency(&ticksPerSecond))
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UTIL_DISPLAYLEVEL(1, "ERROR: QueryPerformanceFrequency() failure\n");
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init = 1;
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}
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return 1000000000ULL*(clockEnd.QuadPart - clockStart.QuadPart)/ticksPerSecond.QuadPart;
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}
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#elif defined(__APPLE__) && defined(__MACH__)
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UTIL_time_t UTIL_getTime(void) { return mach_absolute_time(); }
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U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd)
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{
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static mach_timebase_info_data_t rate;
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static int init = 0;
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if (!init) {
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mach_timebase_info(&rate);
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init = 1;
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}
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return (((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom))/1000ULL;
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}
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U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd)
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{
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static mach_timebase_info_data_t rate;
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static int init = 0;
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|
if (!init) {
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mach_timebase_info(&rate);
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init = 1;
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}
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return ((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom);
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}
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|
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#elif (PLATFORM_POSIX_VERSION >= 200112L) \
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|
&& (defined(__UCLIBC__) \
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|| (defined(__GLIBC__) \
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&& ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 17) \
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|| (__GLIBC__ > 2))))
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UTIL_time_t UTIL_getTime(void)
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{
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|
UTIL_time_t time;
|
|
if (clock_gettime(CLOCK_MONOTONIC, &time))
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|
UTIL_DISPLAYLEVEL(1, "ERROR: Failed to get time\n"); /* we could also exit() */
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|
return time;
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|
}
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UTIL_time_t UTIL_getSpanTime(UTIL_time_t begin, UTIL_time_t end)
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|
{
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|
UTIL_time_t diff;
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if (end.tv_nsec < begin.tv_nsec) {
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diff.tv_sec = (end.tv_sec - 1) - begin.tv_sec;
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diff.tv_nsec = (end.tv_nsec + 1000000000ULL) - begin.tv_nsec;
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|
} else {
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|
diff.tv_sec = end.tv_sec - begin.tv_sec;
|
|
diff.tv_nsec = end.tv_nsec - begin.tv_nsec;
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}
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|
return diff;
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|
}
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U64 UTIL_getSpanTimeMicro(UTIL_time_t begin, UTIL_time_t end)
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{
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|
UTIL_time_t const diff = UTIL_getSpanTime(begin, end);
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|
U64 micro = 0;
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micro += 1000000ULL * diff.tv_sec;
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|
micro += diff.tv_nsec / 1000ULL;
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|
return micro;
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|
}
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|
U64 UTIL_getSpanTimeNano(UTIL_time_t begin, UTIL_time_t end)
|
|
{
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|
UTIL_time_t const diff = UTIL_getSpanTime(begin, end);
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|
U64 nano = 0;
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nano += 1000000000ULL * diff.tv_sec;
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nano += diff.tv_nsec;
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return nano;
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}
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#else /* relies on standard C (note : clock_t measurements can be wrong when using multi-threading) */
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UTIL_time_t UTIL_getTime(void) { return clock(); }
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U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000ULL * (clockEnd - clockStart) / CLOCKS_PER_SEC; }
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U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000000ULL * (clockEnd - clockStart) / CLOCKS_PER_SEC; }
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#endif
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/* returns time span in microseconds */
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|
U64 UTIL_clockSpanMicro(UTIL_time_t clockStart )
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{
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UTIL_time_t const clockEnd = UTIL_getTime();
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return UTIL_getSpanTimeMicro(clockStart, clockEnd);
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}
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|
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/* returns time span in microseconds */
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U64 UTIL_clockSpanNano(UTIL_time_t clockStart )
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{
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UTIL_time_t const clockEnd = UTIL_getTime();
|
|
return UTIL_getSpanTimeNano(clockStart, clockEnd);
|
|
}
|
|
|
|
void UTIL_waitForNextTick(void)
|
|
{
|
|
UTIL_time_t const clockStart = UTIL_getTime();
|
|
UTIL_time_t clockEnd;
|
|
do {
|
|
clockEnd = UTIL_getTime();
|
|
} while (UTIL_getSpanTimeNano(clockStart, clockEnd) == 0);
|
|
}
|
|
|
|
/* count the number of physical cores */
|
|
#if defined(_WIN32) || defined(WIN32)
|
|
|
|
#include <windows.h>
|
|
|
|
typedef BOOL(WINAPI* LPFN_GLPI)(PSYSTEM_LOGICAL_PROCESSOR_INFORMATION, PDWORD);
|
|
|
|
int UTIL_countPhysicalCores(void)
|
|
{
|
|
static int numPhysicalCores = 0;
|
|
if (numPhysicalCores != 0) return numPhysicalCores;
|
|
|
|
{ LPFN_GLPI glpi;
|
|
BOOL done = FALSE;
|
|
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION buffer = NULL;
|
|
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION ptr = NULL;
|
|
DWORD returnLength = 0;
|
|
size_t byteOffset = 0;
|
|
|
|
glpi = (LPFN_GLPI)GetProcAddress(GetModuleHandle(TEXT("kernel32")),
|
|
"GetLogicalProcessorInformation");
|
|
|
|
if (glpi == NULL) {
|
|
goto failed;
|
|
}
|
|
|
|
while(!done) {
|
|
DWORD rc = glpi(buffer, &returnLength);
|
|
if (FALSE == rc) {
|
|
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
|
|
if (buffer)
|
|
free(buffer);
|
|
buffer = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)malloc(returnLength);
|
|
|
|
if (buffer == NULL) {
|
|
perror("zstd");
|
|
exit(1);
|
|
}
|
|
} else {
|
|
/* some other error */
|
|
goto failed;
|
|
}
|
|
} else {
|
|
done = TRUE;
|
|
}
|
|
}
|
|
|
|
ptr = buffer;
|
|
|
|
while (byteOffset + sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) <= returnLength) {
|
|
|
|
if (ptr->Relationship == RelationProcessorCore) {
|
|
numPhysicalCores++;
|
|
}
|
|
|
|
ptr++;
|
|
byteOffset += sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION);
|
|
}
|
|
|
|
free(buffer);
|
|
|
|
return numPhysicalCores;
|
|
}
|
|
|
|
failed:
|
|
/* try to fall back on GetSystemInfo */
|
|
{ SYSTEM_INFO sysinfo;
|
|
GetSystemInfo(&sysinfo);
|
|
numPhysicalCores = sysinfo.dwNumberOfProcessors;
|
|
if (numPhysicalCores == 0) numPhysicalCores = 1; /* just in case */
|
|
}
|
|
return numPhysicalCores;
|
|
}
|
|
|
|
#elif defined(__APPLE__)
|
|
|
|
#include <sys/sysctl.h>
|
|
|
|
/* Use apple-provided syscall
|
|
* see: man 3 sysctl */
|
|
int UTIL_countPhysicalCores(void)
|
|
{
|
|
static S32 numPhysicalCores = 0; /* apple specifies int32_t */
|
|
if (numPhysicalCores != 0) return numPhysicalCores;
|
|
|
|
{ size_t size = sizeof(S32);
|
|
int const ret = sysctlbyname("hw.physicalcpu", &numPhysicalCores, &size, NULL, 0);
|
|
if (ret != 0) {
|
|
if (errno == ENOENT) {
|
|
/* entry not present, fall back on 1 */
|
|
numPhysicalCores = 1;
|
|
} else {
|
|
perror("zstd: can't get number of physical cpus");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
return numPhysicalCores;
|
|
}
|
|
}
|
|
|
|
#elif defined(__linux__)
|
|
|
|
/* parse /proc/cpuinfo
|
|
* siblings / cpu cores should give hyperthreading ratio
|
|
* otherwise fall back on sysconf */
|
|
int UTIL_countPhysicalCores(void)
|
|
{
|
|
static int numPhysicalCores = 0;
|
|
|
|
if (numPhysicalCores != 0) return numPhysicalCores;
|
|
|
|
numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
|
|
if (numPhysicalCores == -1) {
|
|
/* value not queryable, fall back on 1 */
|
|
return numPhysicalCores = 1;
|
|
}
|
|
|
|
/* try to determine if there's hyperthreading */
|
|
{ FILE* const cpuinfo = fopen("/proc/cpuinfo", "r");
|
|
#define BUF_SIZE 80
|
|
char buff[BUF_SIZE];
|
|
|
|
int siblings = 0;
|
|
int cpu_cores = 0;
|
|
int ratio = 1;
|
|
|
|
if (cpuinfo == NULL) {
|
|
/* fall back on the sysconf value */
|
|
return numPhysicalCores;
|
|
}
|
|
|
|
/* assume the cpu cores/siblings values will be constant across all
|
|
* present processors */
|
|
while (!feof(cpuinfo)) {
|
|
if (fgets(buff, BUF_SIZE, cpuinfo) != NULL) {
|
|
if (strncmp(buff, "siblings", 8) == 0) {
|
|
const char* const sep = strchr(buff, ':');
|
|
if (*sep == '\0') {
|
|
/* formatting was broken? */
|
|
goto failed;
|
|
}
|
|
|
|
siblings = atoi(sep + 1);
|
|
}
|
|
if (strncmp(buff, "cpu cores", 9) == 0) {
|
|
const char* const sep = strchr(buff, ':');
|
|
if (*sep == '\0') {
|
|
/* formatting was broken? */
|
|
goto failed;
|
|
}
|
|
|
|
cpu_cores = atoi(sep + 1);
|
|
}
|
|
} else if (ferror(cpuinfo)) {
|
|
/* fall back on the sysconf value */
|
|
goto failed;
|
|
}
|
|
}
|
|
if (siblings && cpu_cores) {
|
|
ratio = siblings / cpu_cores;
|
|
}
|
|
failed:
|
|
fclose(cpuinfo);
|
|
return numPhysicalCores = numPhysicalCores / ratio;
|
|
}
|
|
}
|
|
|
|
#elif defined(__FreeBSD__)
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
/* Use physical core sysctl when available
|
|
* see: man 4 smp, man 3 sysctl */
|
|
int UTIL_countPhysicalCores(void)
|
|
{
|
|
static int numPhysicalCores = 0; /* freebsd sysctl is native int sized */
|
|
if (numPhysicalCores != 0) return numPhysicalCores;
|
|
|
|
#if __FreeBSD_version >= 1300008
|
|
{ size_t size = sizeof(numPhysicalCores);
|
|
int ret = sysctlbyname("kern.smp.cores", &numPhysicalCores, &size, NULL, 0);
|
|
if (ret == 0) return numPhysicalCores;
|
|
if (errno != ENOENT) {
|
|
perror("zstd: can't get number of physical cpus");
|
|
exit(1);
|
|
}
|
|
/* sysctl not present, fall through to older sysconf method */
|
|
}
|
|
#endif
|
|
|
|
numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
|
|
if (numPhysicalCores == -1) {
|
|
/* value not queryable, fall back on 1 */
|
|
numPhysicalCores = 1;
|
|
}
|
|
return numPhysicalCores;
|
|
}
|
|
|
|
#elif defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
|
|
|
|
/* Use POSIX sysconf
|
|
* see: man 3 sysconf */
|
|
int UTIL_countPhysicalCores(void)
|
|
{
|
|
static int numPhysicalCores = 0;
|
|
|
|
if (numPhysicalCores != 0) return numPhysicalCores;
|
|
|
|
numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
|
|
if (numPhysicalCores == -1) {
|
|
/* value not queryable, fall back on 1 */
|
|
return numPhysicalCores = 1;
|
|
}
|
|
return numPhysicalCores;
|
|
}
|
|
|
|
#else
|
|
|
|
int UTIL_countPhysicalCores(void)
|
|
{
|
|
/* assume 1 */
|
|
return 1;
|
|
}
|
|
|
|
#endif
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|